Honda WX15T Manual page 95

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CYLINDER HEAD
CYLINDER HEAD/VALVE
INSPECTION
VALVE STEM O.D.
Inspect each valve face for pitting or wear irregularities.
Inspect each valve stem [1] for bending or abnormal
stem wear.
Replace the valve if necessary.
Measure and record each valve stem O.D.
STANDARD:
IN: 3.970 – 3.985 mm (0.1563 – 0.1569 in)
EX: 3.935 – 3.950 mm (0.1549 – 0.1555 in)
SERVICE LIMIT:
IN: 3.900 mm (0.1535 in)
EX: 3.880 mm (0.1528 in)
Replace the valves if their O.D. is smaller than the
service limit
VALVE GUIDE I.D.
Measure and record each valve guide I.D.
STANDARD: 4.000 – 4.018 mm (0.1575 – 0.1582 in)
SERVICE LIMIT: 4.060 mm (0.1598 in)
Replace the cylinder barrel if the measurement exceeds
the service limit.
GUIDE-TO-STEM CLEARANCE
Subtract each valve stem O.D. from the corresponding
guide I.D. to obtain the stem-to-guide clearance.
STANDARD:
IN: 0.015 – 0.048 mm (0.0006 – 0.0019 in)
EX: 0.050 – 0.083 mm (0.0020 – 0.0033 in)
SERVICE LIMIT:
IN: 0.098 mm (0.0039 in)
EX: 0.120 mm (0.0047 in)
If the calculated clearance is more than the service limit,
replace the valve and cylinder barrel as a set.
VALVE SPRING FREE LENGTH
Measure the valve spring free length.
STANDARD: 23.7 mm (0.93 in)
SERVICE LIMIT: 22.8 mm (0.90 in)
If the measured length is less than the service limit,
replace the valve spring.
12-4
(page 12-2).
[1]